Being dealt the same hole cards several times in a night isn't unusual, but the combinations made possible by the river mean you could play for a lifetime and still not see exactly the same thing happen twice in a full hand.

Possibilities

Hole card combinations

(if you overlook the suits of the cards you are dealt)                              169                                                                                                                       

Hole card combinations

(if you account for the suits of the cards you are dealt)                       1,326

Starting hands for your opponents

(if you account for the suits of the cards you are dealt)                       1,225

Flops to your hole cards

For example, you have -   and the flop is. 

, ,                                                                                   19,600                                                                                                                                                                                                                                       

Full board combinations

That is, if you dealt out five cards from the deck 

 say, excluding the two you have in the hole.                                 2,118,760                    

Five card hands

For instance if you dealt out five cards                                          2,598,960

Seven-card combinations ( hole cards plus board)

If you dealt out seven cards                                                        133,784,560